Audio book return

I wanted to download The Godfather by Mario Puzo to my iPad. I accidentally downloaded the audio book, which I haven’t opened and have no intention of listening to. I would like to return it and download the written book from you. I know this is against regular policy, but as someone who has only downloaded written words and prefers that mode, I was hoping you would make an exception for a regular customer. It would be greatly appreciated. I will be more careful to look out for the headphones before I make any future downloads.